81a - a^3 = a(81-a^2) = a(9-a)(9+a)
6b^2 - 36b + 54 = 6(b^2 - 6b + 9) = 6(b-3)^2 или 6(b-3)(b-3)
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81a - a^3 = a(81-a^2) = a(9-a)(9+a)
6b^2 - 36b + 54 = 6(b^2 - 6b + 9) = 6(b-3)^2 или 6(b-3)(b-3)